How to know your public IP with a single command

From the erjaimer's blog is that I get this very useful tip.

Happens that erjaimer He explains to us how in a single line, we can know our public IP (real IP), but also invites anyone who wants to improve the line to do so ... and well ... they know that I am a big fan of bash, so I did the odd change. This is my line:

GET http://www.vermiip.es/  | grep "Tu IP p&uacute;blica es" | cut -d ':' -f2 | cut -d '<' -f1

Let's see a screenshot of the result we get with my changes:

His line is as follows:

GET http://www.vermiip.es/ | grep "Tu IP pública es" | perl -pe 's/(.*:)||\s+//g;'

And what would it look like using the original line:

The explanation of the original command is provided by the same erjaimer en Article:

1. The command GET It is in any GNU / Linux distro and as its name indicates it downloads an HTML given a URL.
2. The next step is to look at the HTML document to see what IP the page is showing us. In this second step we obtain this result: Your public IP is: xx.xx.xxx.xxx, where obviously the X's are numbers.
3. The next step I will use regular expressions and PERL as a console command, filtering the letters, etc. perl -pe 's /(.* :) | (<\ / h2>) | (\ s +) // g; , this regex is made a little lightly, I propose to improve it or even using grep a little better it can be removed.

And here I leave the explanation of mine:

1. Through GET We download the HTML of that URL, which tells us our IP and also a lot of more text that we do not want.
2. We will clean all that unwanted code, leaving only the IP line through grep.
3. The problem is that it shows us the IP with a small text and H2 tags, so now using twice cut we will clean everything and only leave the IP.
4. (1st cut) »We clean the text and the 1st H2 tag simply saying that it does not show anything that is from the : (two points) to the left, leaving only an H2 tag at the end.
5. (1st cut) »We clean this last H2 tag with the other cut, which will not show anything from the first <to its right. Remaining only the IP.

Any method (command) that you use will give you the same result, I simply wanted to make my contribution, because when seeing the command line with regular expressions and perl, it would be difficult to explain character by character to others haha.

Anyway, I hope you like it and a thousand thanks to erjaimer for having written the original article.

regards